Surface and Interface Engineering for Advanced Nanofiltration Membranes

Guo, Bian‐Bian; Zhu, Cheng‐Ye; Xu, Zhi‐Kang

doi:10.1007/s10118-022-2654-z

Cited by 11 publications

(4 citation statements)

References 110 publications

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“…Interfacial polymerization has attracted more and more attention in recent years because of its advantages of facile operation and easy control of film thickness. 28 It has become one of the main preparation methods for composite membranes. 29 The interfacial polymerization method refers to the process in which two monomers with high chemical activity carry out a rapid polycondensation at the interface of two immiscible solvents to form an ultrathin skin layer on the surface of the porous substrate.…”

Section: Interfacial Polymerizationmentioning

confidence: 99%

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Electrospun Nanofibrous Composite Membranes for Separations

et al. 2023

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Conspectus Electrospinning is regarded as an efficient method for directly and continuously fabricating nanofibers. The electrospinning process is relatively simple and convenient to operate and can be used to prepare polymer nanofibers for almost all polymer solutions, melts, emulsions, and suspensions with sufficient viscosity. In addition, inorganic nanofibers can also be prepared via electrospinning by adding small amounts of polymers into the inorganic precursors, which are generally regarded as nonspinnable. The diameter of the electrospun nanofibers can be tuned from tens of nanometers to submicrons by changing the spinning parameters. The nonwoven fabric stacked with electrospun fibers is a porous material with interconnected submicron pores, providing a porosity above 80%. However, limited by the unstable rheological properties of the electrospinning fluid, it is difficult to obtain nanofibers stably and continuously with an average diameter of <100 nm, which narrows the separation applications of the electrospun nanofibrous membranes to only microfiltration, air filtration, or use as membrane substrates. Therefore, to fully take advantage of electrospun nanofibrous membranes in other separation applications, electrospun nanofibrous composite (ENC) membranes were developed to improve and optimize their selectivity, permeability, and other separation performances. The composite membranes not only have all the advantages of single-layered or single-component membranes, but also have more flexibility in the choice of functional components. In this account, we summarize the two combination strategies to design and fabricate ENC membranes. One is based on the component combination, in which functional components are homogeneously or heterogeneously mixed in the fiber matrix or modified on the nanofiber surface. The other one is termed as the interfacial combination, in which functional skin layers are fabricated on the top of the electrospun membranes via interfacial deposition or interfacial polymerization, to construct selective barriers. The specific preparation approaches in the two combination strategies are discussed systematically. Additionally, the structural characteristics and separation performances of ENC membranes fabricated via these approaches are also compared and analyzed to clarify their advantages and range of utilization. Subsequently, the six applications of ENC membranes we focus on are demonstrated, including adsorption, membrane distillation, oil/water emulsion separation, nanofiltration, hemodialysis, and pervaporation. To meet their different requirements for separations, our consideration about the choice of combination strategies, related preparation methods, and functional components are discussed based on typical research cases. In the end, we conclude this account with an overview of the challenges in industrial manufacturing, mechanical strength, and interfacial attachment of ENC membranes and prospect their future developments.

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Section: Interfacial Polymerizationmentioning

confidence: 99%

“…Interfacial polymerization has attracted more and more attention in recent years because of its advantages of facile operation and easy control of film thickness . It has become one of the main preparation methods for composite membranes .…”

Section: Interfacial Combination To Fabricate Enc Membranesmentioning

confidence: 99%

Electrospun Nanofibrous Composite Membranes for Separations

et al. 2023

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“…Over the past years, recovery and reuse of water have become one of the main priorities of human beings owing to the global warming, severe water pollution, and increased demand for water resources. − Membrane-based separation techniques have received increased attention because of the high efficiency, low energy consumption, and modular design. , Nanofiltration membranes are capable of separating divalent salt ions, dyes, and most organic matters from water by the Donnan effect and pore size sieving, which have been extensively used in the fields of water softening and treatment of industrial effluent. − Among different types of nanofiltration membranes, polyamide (PA) thin-film composite (TFC) membranes have been widely used as commercialized nanofiltration membranes. , A PA-TFC membrane is composed of a PA selective layer and a polymeric porous substrate. The PA layer dominates the separation performance of the membranes and is usually synthesized by interfacial polymerization between diamine monomers such as piperazine (PIP) or m -phenylenediamine (MPD) in an aqueous solution and trimesoyl chloride (TMC) in an organic solution …”

Section: Introductionmentioning

confidence: 99%

“…6−9 Among different types of nanofiltration membranes, polyamide (PA) thin-film composite (TFC) membranes have been widely used as commercialized nanofiltration membranes. 10,11 A PA-TFC membrane is composed of a PA selective layer and a polymeric porous substrate. The PA layer dominates the separation performance of the membranes and is usually synthesized by interfacial polymerization between diamine monomers such as piperazine (PIP) or m-phenylenediamine (MPD) in an aqueous solution and trimesoyl chloride (TMC) in an organic solution.…”

Section: ■ Introductionmentioning

confidence: 99%

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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Nanofiltration membranes have been widely used in many fields owing to their high separation efficiency and low energy assumption. However, traditional substrates for thin-film composite (TFC) nanofiltration membranes, such as polysulfone or polyethersulfone ultrafiltration membranes, suffer from low surface porosity and poor stability in organic solvents. A microporous polypropylene membrane (MPPM) possesses high organic solvent resistance, high porosity, but poor hydrophilicity. Herein, MPPMs were surface hydrophilized for the preparation of TFC membranes by interfacial polymerization. A green, fast, and stable deposition system based on ferulic acid and Fe3+ was employed for surface hydrophilization of MPPM, and thus, the aqueous solution of piperazine can homogeneously distribute on the substrate surface, which was directly visualized by confocal laser scanning microscopy. The nanofiltration membranes show rejection of 98.1% to Na2SO4 and water permeation flux of about 16 L/m2·h·bar. Moreover, the membranes are stable in a variety of common organic solvents, demonstrating the potential in organic solvent nanofiltration. The proposed strategy expands the selection of porous substrates for interfacial polymerization and harsh application environments for nanofiltration.

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